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The effect of calcium stearates (CaSt 2 ) and zinc stearates (ZnSt 2 ) on polyene formation of poly(vinyl chloride) (PVC) was investigated by gel content, ultraviolet (UV)–visible, Fourier transform infrared and static stability analyses. The linear polyene sequences are preferred to form in pure PVC and the PVC/CaSt 2 mixture during degradation, and while crosslinking polyene is found in the PVC/ZnSt 2 and PVC/ZnSt 2 /CaSt 2 mixtures. The gel content increases with first high slope of 39.80 and second low slope of 7.37 in the PVC/ZnSt 2 mixture. The crosslinking degree reaches 41.62%, when adding 3 phr ZnSt 2 . For the PVC/ZnSt 2 /CaSt 2 mixture, the crosslinking reaction is delayed by CaSt 2 because of their synergistic effect.
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Wang et al. (2012) studied this question.
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